具有多个参数的数据绑定绑定适配器不起作用

Question

我试图使用数据绑定来加载带有多个参数的Glide,Imageview和Bindingadapter的图像:

@BindingAdapter(value = ["url", "defaultImage", "placeholder", "circleCrop"], requireAll = false)
fun ImageView.setImageUrl(url: String, defaultResId: Int? = null, placeHolderResId: Int? = null, circleCrop: Boolean = false) {
    val glideRequest = if (defaultResId != null) GlideApp.with(context).loadOrDefault(url, defaultResId)
    else GlideApp.with(context).load(url)
    if (placeHolderResId != null) glideRequest.placeholder(placeHolderResId)
    if (circleCrop) glideRequest.circleCrop()
    glideRequest.into(this)
}

<ImageView
        android:id="@+id/imgProfile"
        android:layout_width="@dimen/size_avatar_search_result"
        android:layout_height="0dp"
        app:circleCrop="@{true}"
        app:defaultImage="@{@drawable/default_avatar}"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:placeholder="@{@drawable/default_avatar}"
        app:url="@{item.profilePhotoUrl}"
        tools:src="@drawable/default_avatar" />

bindingadapter方法是顶级函数.在编译时,我得到了数据绑定kapt错误'无法找到属性的设置者'app:circleCrop',在android.widget.ImageView上有参数类型boolean',就像我的bindingadapter无法识别一样.不确定我做错了什么

Answer 1

即使编译器说问题在于app:circleCrop,实际问题在于defaultResId和placeholderResId.

在xml中使用drawable时@{@drawable/default_avatar},它总是被编译成Drawable.

因此,您的绑定适配器必须具有签名:

@BindingAdapter(value = ["url", "defaultImage", "placeholder", "circleCrop"], requireAll = false)
fun ImageView.setImageUrl(url: String, default: Drawable? = null, placeholder: Drawable? = null, circleCrop: Boolean = false) {
  // code
}

当您查看生成的代码时(例如,fragment_something.xml通常是布局FragmentSomethingBinding),您可以看到结果,并且您会看到可绘制资源使用getDrawableFromResource()函数.